Andy, along with his parents, _____ to Canada for a holiday since last Sunday.
| A．were going | B．was going |
| C．have gone | D．has gone |
The doorbell had been ringing for several minutes before it ______.
A answered B had answered C was answering D was answered
The box _____. Better call in a mechanic(修理工).
A isn’t open B hasn’t been open C isn’t be open D won’t open
The workers _____busily when the boss came to look for something she ______in the office.
A had worked, had leftB were working ; had left C working ; had left D had worked; left
I’m afraid it will be two months______.
A when I come back B when I’ll come back C before I come back D before I’ll come back
---- How is the old man now?
---- Sorry, he ______ though they did all they could to save him.
| A．was dead | B．had died | C．has been dead | D．died |